Olga Craveiro Joaquim Macedo Henrique Madeira Use of Co-occurrences for Temporal Expressions Annotation. 156-164 2009 SPIRE http://dx.doi.org/10.1007/978-3-642-03784-9_15 conf/spire/2009 db/conf/spire/spire2009.html#CraveiroMM09